In the present-day universe, galaxies can be divided into two main categories: young blue disk galaxies that are actively forming new stars, and old red elliptical galaxies that are passively evolving and forming no new stars any further. It is known that some of star-forming disk galaxies should evolve into passively-evolving ellipticals in the past. However, due to its relatively short...
From the observation of cosmic microwave background (CMB), we found the pattern of temperature fluctuation that has variation of one hot pole and one cold pole, i.e. dipole pattern. This indicates our motion relative to the CMB rest-frame, which is also taken to be rest-frame of the universe. From the CMB dipole field, we determine the velocity of the Sun $(V_⊙)$ or solar system with respect...
Cosmic Microwave Background (CMB) is the most important evidence for the Big Bang theory. The CMB radiation has been traversing the universe towards us since 378,000 years after the Big Bang. It was accidentally discovered by Arno Penzias and Robert Wilson in 1964 using their horn-feed antenna. This research is looking at foreground emissions of the CMB signal, focusing on synchrotron,...
The position of the moon in Thai culture is divided into 27 sections according to sidereal period using reference from fixed stars. These fixed stars have 27 groups, called the lunar mansions. The days of full moon in some lunar mansions were assigned to the Buddhist holy days such as Magha Puja, Visakah Puja and Asalha Puja. It was found that before the Adhikamasa year and in the Adhikamasa...
Teerayut Loylip1,2 , Suwicha Wannawichian2
1Department of Astronomy, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
2National Astronomical Research Institute of Thailand (NARIT), Chiang Mai, Thailand
ABSTRACT
Fireball is the extremely bright meteor, which could be asteroid, comet or near Earth objects (NEOs). Those objects fall through the Earth’s atmosphere,...
In this work, we study the Starobinsky's model of inflation in the context of gravity's rainbow theory. We assume that the rainbow function can be written in the power-law form of the Hubble parameter. In addition, we clearly formulate the expressions of the spectral indices, the power spectra, and the tensor-to-scalar ratio associated with both scalar and tensor perturbations and we also...
Active Galactic Nuclei (AGNs) typically show variability on all time
scales which can range from days to years. The purpose of this work is
to study intra-year variability (i.e., months-timescale) of AGNs
through photometric monitoring in order to determine candidates for a
follow-up study for reverberation mapping techniques. Our sample of
AGNs are drawn from a well-defined quasar sample...
We present a multiwavelength investigation of the young stellar population and star formation activities in the HII region Sharpless 311. Using our deep near-infrared observations and archival Spitzer-IRAC observations, we have detected a total of 125 Young Stellar Objects (YSOs) in an area of $\sim$86 arcmin$^2$. The YSO sample includes 8 Class I and 117 Class II candidate YSOs. The mass...
